TC Pipelines, LP and its subsidiaries engage in the acquisition and management of pipelines in the United States. It owns a 30% general partner interest in Northern Border Pipeline Company, which owns 1,249-mile interstate pipeline system that transports natural gas from the Montana-Saskatchewan border to markets in the Midwestern. The company also owns 49% general partner interest in Tuscarora Gas Transmission Company that owns a 240-mile interstate pipeline system, which transports natural gas from Oregon to northern Nevada. TC PipeLines GP, Inc. serves as the general partner of the partnership. TC PipeLines was founded in 1998 and is based in Westborough, Massachusetts.